tests: Make tests aware of meson test wrapper

tests: Make tests aware of meson test wrapper

Meson 0.55.0 will set the MESON_EXE_WRAPPER environment variable to the
joined version of that wrapper if it is needed. Our tests that take
compiled targets as arguments can use that information to run cross
built binaries, or if there isn't a wrapper and we get an ENOEXEC, we
can skip the tests gracefully.

We try to use mesonlib.split_args, which handles windows arguments
better than python's builtin shlex module, but fall back to that if the
meson module isn't available for some reason.

Cc: 20.0 20.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5103>